Stuck at white startup screen

ok so my hard disk recently became full unexpectedly so I downloaded a few applications to clear out the small unneeded files that just take up disk space.
Upon clearing out the files, I think the program might have deleted some vital files because when I tried to restart my computer and it's now stuck at the white loading screen with the grey apple.
I tried to shut it back on and back off, I removed it from the power cord and I removed and put the battery back in. I also put my Snow Leopard installation disc back in in attempt to re-install the operating system and replace the deleted files, but I can;t get past the white screen and now I can;t get the disc out.
Is there anything I can do tonight to fix the problem, or will I just have to wait until I can bring it into the store? I have some files i need to access tonight because I have a big exam tomorrow so it's pretty urgent.
Thanks in advance.

Press the Power Button and immediately press and hold down the Command and the S keys as the machine starts up. This boots you into Single-user mode and you should see white text appear on the screen.
When you see the # Command prompt, type /sbin/fsck-fy and hit the Return.
Now sit back & let your computer do its thing. This should take approximately 15 minutes or so. Depending on how messed up your computer is. Just be patient.
If and when you see the message File System was modified repeat the steps above again & again until you hopefully see the message no problems were found." When that happens type reboot and hit Return again.
If these steps do not work then boot from your install disc to repair disk. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
Starting up in single-user mode
http://support.apple.com/kb/TS2570

Similar Messages

IMac g5 is stuck at white startup screen with apple logo & spinning circle

Hello,
i had a digital copy of os x leopard and i was trying to reinstall it, so i would double click on install mac os x, and it would tell me to restart, i would do this but nothing happened so i had to mount the disk again and double click install mac os x, and it told me to restart again. so i looked up how to install leopard from a dmg file, and it said to restore the dmg to the drive, so i went into disk utility and i put the source as the dmg, and the destination i dragged the imac hdd icon. it finished and i was gonna select the leopard file as my startup disk in system preferences, but that wouldnt run. i then noticed some of the letters were missing on the name of the icons in the dock, so i just restarted the computer, but it got stuck on the white screen. i tried lots of stuff like turning on while holding shift, but it didnt do anything, and i tried with cmd+s and that gave me some black command prompt where i typed/sbin/fsck -fy and that did some stuff and it said my drive was okay, but it still wont start up. What do i do?!?!

im trying tiger right now, first i wanna reinstall tiger, than leopard next, you know, one problem at a time. i dunno maybe, heres the readme:
Read Before You Install
Mac OS X
Read this document before you install Mac OS X. It includes information about
supported computers, system requirements, and installing Mac OS X.
For more information about Mac OS X, visit this website:
• www.apple.com/macosx/
For the latest information about using Mac OS X, connect to the Internet and open Mac
Help. To open Mac Help, click the Help menu in the Finder and choose Mac Help.
For information about the support available for this product, see the AppleCare
Software Services and Support Guide included with Mac OS X.
System requirements
You must have a Macintosh computer with:
• a PowerPC G3, G4, or G5 processor
• a DVD drive
• built-in FireWire
• at least 256 MB of RAM
• a built-in display or a display connected to an Apple-supplied video card supported
by your computer
• at least 3 GB of disk space available, or 4 GB if you install the developer tools
If you see a message in the Installer that you do not have enough disk space to install
Mac OS X, you can deselect items to save space. To deselect items, click Custom Install
in the Easy Install panel.
Updating your computer’s firmware
You may need to update your computer’s firmware. It’s best to update the firmware
before installing Mac OS X. If you haven’t started the Mac OS X Installer, check the
Apple Software Updates website to see if there are any firmware updates for your
computer:
• www.apple.com/support/downloads/
If you don’t do this, you may see a message that you need to update your computer’s
firmware when you start the Installer. To update the firmware, you will need to quit the
Installer and restart your computer using your current startup disk, then check the
Software Updates website.
If you have problems with your computer after installing this version of Mac OS X, you
might need to update the firmware even though you did not see a message when you
installed the software. Check the Software Updates website for recent firmware updates
for your computer.
Starting installation
To start installing Mac OS X, insert the Mac OS X Install DVD and double-click the
Install Mac OS X icon:
You can also start installing Mac OS X by inserting the Install DVD and restarting your
computer while holding down the C key, or by selecting the Install DVD as your startup
disk using Startup Disk preferences.
Quitting the Installer
If you need to quit the Installer before you click Install in the Easy Install or Custom
Install pane, choose Quit Installer from the Installer application menu, then click
Startup Disk to select a startup disk for your computer.
If you have already clicked Install, wait until installation finishes.
Advice about hardware compatibility
Installing on a Power Macintosh G3 (Blue and White)
If you have a Power Macintosh G3 (Blue and White) that came with an Apple SCSI hard
disk, do not choose UNIX File System (UFS) as the format for the destination disk.
Installing on a computer with a third-party SCSI card
If you have a third-party SCSI card installed in your computer and you cannot start up
Mac OS X, attach a disk drive or terminator to one of the card’s ports. If you continue
to have problems, try removing the card. Contact the manufacturer of the card for
more information about using the card with Mac OS X.
Installing on a computer with a third-party video card
If you have a third-party video card installed in your computer, you may need to
remove it before you install Mac OS X. Contact the manufacturer of the card for more
information about using the card with Mac OS X.
Advice about installing Mac OS X
Erasing and formatting your disk
When you install Mac OS X, you can erase the destination disk you select. In the “Select
a Destination” pane of the Installer, click the Options button. Select Erase and Install
then choose a format. In most cases, choose Mac OS Extended (Journaled).
Important Do not choose UNIX File System (UFS) unless you need to work with this
format. If you choose UFS, Mac OS 9 and all Mac OS 9 applications must be installed on
a Mac OS Extended format disk to use them with the Classic environment.
To install Mac OS X on the same disk or disk partition as Mac OS 9, the disk must be in
Mac OS Extended format. If it isn’t, quit the Installer and back up your files, then
reformat the disk.
You can also partition your hard disk into several volumes before you install Mac OS X.
In the Installer, choose Utilities > Open Disk Utility and click Partition. Partitioning the
disk erases the entire disk, so be sure to back up your files first.
Installing optional software
Easy Install installs all the software you need to use Mac OS X, but does not install
some additional software. If you want to install this optional software or you don’t
want to install all the software installed using Easy Install, click Custom Install and
select the items you want to install. If you want to install this optional software later,
insert the Mac OS X Install DVD and double-click Optional Installs.
Locating the Installer log
When you install Mac OS X, the Installer saves a log of the installation. To see the log,
open Console (in /Applications/Utilities), click Logs, then click the triangle next to /
var/log and select install.log.
Reinstalling Mac OS X
To reinstall Mac OS X, insert the Mac OS X Install DVD and double-click the Install
Mac OS X icon, then follow the onscreen instructions. When you see the “Select a
Destination” pane, click Options to select how to install Mac OS X:
• Select “Archive and Install” to save your existing system files, user accounts and
their home folders, and existing network settings. The Installer saves files in a
folder named Previous System so that you can copy them to an appropriate location
later. You cannot start up your computer using the Previous System folder.
• Select “Erase and Install” to erase the destination volume and install a new copy of
Mac OS X. If you select this option, you will lose all your files and the software you
have installed on the destination volume, so you may want to back it up first. If you
select this option, you can choose the format for the volume. In most cases, choose
Mac OS Extended (Journaled) from the pop-up menu.
Setting up and connecting to the Internet
If you have an existing Internet service provider (ISP) and you’re installing Mac OS X for
the first time, you need to enter your Internet connection information when installation
finishes. Be sure to have the information available. If you have problems connecting to
the Internet, contact your ISP to make sure you have the correct information.
Advice about using Mac OS X
If you have problems starting up
If you cannot start up your computer, insert the Mac OS X Install DVD and restart your
computer while holding down the C key. Choose, Choose > Open Disk Utility, then
click First Aid to repair your disk.
If you have problems starting up your computer and you have devices connected to
your computer such as FireWire drives, USB printers, or external displays, try
disconnecting them before starting up again.
Upgrading your applications and other software
For best results with Mac OS X, look for versions of your applications that are built for
Mac OS X. Check the Mac OS X website for information about available applications:
• www.apple.com/macosx/
If you cannot find Mac OS X versions, upgrade to the latest Mac OS 9 version to use
with the Mac OS X Classic environment. Check with the manufacturers for the latest
updates.
Using POP email accounts and On My Mac mailboxes in Tiger and Panther
If you have a shared home folder and you access a POP email account using Mail in
both Mac OS X Panther and Mac OS X Tiger, you will not see messages that you retrieve
in one version when you switch to the other.
As an alternative, you can deselect the option to remove copies from the server after
retrieving your messages. To change this option, open the Accounts pane of Mail
preferences and click Advanced.
You will not see messages saved in a mailbox on your computer when you switch from
one version to another. To avoid this problem, use separate home folders for each
version of Mac OS X.
Your IMAP account will synchronize automatically when you switch between Mail in
Tiger and Panther.
© 2005 Apple Computer, Inc. All rights reserved. Apple, the Apple logo, FireWire, Macintosh, Mac OS, and
Power Macintosh are trademarks of Apple Computer, Inc., registered in the U.S. and other countries.
PowerPC is a trademark of International Business Corporation, used under license therefrom.
it says that a imac g5 can work

Macbook stuck on white startup screen

Good Afternoon,
Yesterday evening I was running Pages, suddenly everything went stuck and I had the "rainbow wheel". It was an important file so I just wanted to wait untill it was fixed again. Waiting for 1 hour without any solution, then I decided to force my macbook out(held the power button for 5 seconds).
It felt like my macbook was overheat so I waited for a few hours to turn it back on. When I actually turned it on, you heard the noice "bzztbzzt, tuduuum" but then nothing happens, only the white screen shows up, Ive waited for hours and hours to see if anything would happen, I've googled the problem and i've tried (i guess) all the combinations with starting up. It still stucks on the white screen.
I've decided to run the battery empty and waited all night, when I woke up this morning I tried to turn it on again, nothing happend, just the white screen.
Im desperate and YES I know there are more topic about this, but couldn't find the answer!
Also my macbook is not just "silence" at the white screen, sometimes the processor is working hard, also the macbook is getting extremely warm.
One more note, This happend to me before, but then 2 hours later it was fixed, so I hoped that would work this time again, but unfortunatley.
All idea's are welcome and ill try them!
Greetings,
Rinke

Mac OS X: Gray screen appears during startup - Apple Support
Intel-based Mac: Startup sequence and error codes, symbols - Apple Support
I think you'd better off making Genius Bar appointment and show them your problem.

T400 is Stuck on Thinkpad Startup Screen

Had the laptop for 11 months no issues, I woke up to find the computer stuck on the startup screen. Tried rebooting, took out the battery, tried it pluged in, unpluged and it keeps stopping at the startup screen. Any suggestions?
Solved!
Go to Solution.

Hello mate,
Unplug the AC adapter and take out the battery.
Then, you push the power button 10 times in a row at one second intervals.
Next, you push and hold the power button for 30 seconds.
Then you put the battery back in and push the power button to turn on the computer.
See if it works.
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information on it.
ThinkPad T510 4313-CTO Windows 8 x64 - Intel Core i7-620M - NVIDIA NVS 3100M - 8GB RAM - 240GB SSD- Intel Centrino Ultimate-N 6300 - Gobi 2000.
ThinkPad Helix 3697-CTO Windows 8.1 x64 - Intel Core i7-3667U - Intel HD Graphics 4000 - 8GB RAM- 256GB SSD - Intel Centrino Advanced-N 6205 - Ericsson C5621gw

My iPod is stuck on the startup screen, showing just the apple logo. Has anyone had this problem before? If yes, then how did you solve it?

My iPod is stuck on the startup screen, showing just the apple logo. Has anyone had this problem before? If yes, then how did you solve it?

Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

Lenovo ThinkPad R500 gets stuck on the startup screen

Hello!
I searched for a solution but couldn't find one.
In my company we only use Thinkpads and I got an R500 wich was replaced by a newer model.
It was working (I saw it), the admin told me he would delete the bios-password. He opened BIOS->Security (did see wich password he changed) closed it and gave it to me.
Now on startup it is stuck on the startup screen saying "To interrupt normal startup, press blue ThinkVantage button", and no button does anything. I removed CMOS-Battery but still the same.
Any help appreciated
Best regard
Proton

Check USB port whether it is broken or pin is touching each other.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

Why does my macbook pro gets stuck in the startup screen?? its the older versiom

its like stuck in the startup screen. i tried a few times and even took out the battery twice. please help!! i have some important document stored inside i cannot retrieve now!!!!
i think the operating system is like 10.7.something

You might have a failing hard drive. If you're running 10.7.x, try booting into your Recovery partition - holding down the Command and R keys whilst booting. Once at the installatio screen, use Disk Utility to verify and, if needed, repair your hard drive. If it can be repaired, you should be good to go - if it can't be repaired then you're going to need to go shopping for a new drive.
Clinton

MacBook Pro (late 2011) stuck at white Apple screen.

Hi all. My MacBook Pro 13 inch (late 2011) is giving me the same problem over and over again.
Few months ago, I had sent it to Apple for repair due to faulty HDD. Now the same problem happened again. The MacBook will stuck at the white Apple screen with the circle turning when attempting to switch on.
However, Apple had just replace a new HDD and why it's still happening again?
Can anybody here please assist to advice me what is making my Mac unable to start up, stuck at the white Apple screen, even after replacing a new HDD?
Thank you!

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
a. Boot into the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3
Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is damaged and the drive is probably malfunctioning. In that case, go to step 5.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 6
Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.
Step 7
Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup.
Step 8
A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
Step 9
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

Macbook pro won't boot, stuck on white apple screen

Noticed today, that my macbook pro won't boot . It gets to the white apple screen with the spinner under the apple logo. It stays like this for a long time without doing anything except spinning.
I've powered down and tried to boot up several times.
I have boot camp and windows on my mac and when the white screen appears, I can press Option to bring up which hard drive and the Windows partition will load without any problems.

Exacty what happens when you try to boot up from the disc that came with your computer? Are you holding down the c key? Have you tried holding down the "option key?" Are you able to run the Hardware Test - Intel-based Macs: Using Apple Hardware Test
Shut down your computer and disconnect all peripherals (keyboard & mouse if pertinent) from your computer. Now reboot.
If the Mac starts up normally, shut it down again and then plug in one of the peripherals (keyboard or mouse first) and start up your computer again. If it does so successfully repeat the process, adding one peripheral at a time until your Mac acts up. At that point, disconnect the last peripheral you added, reboot your Mac and search the peripheral vendor's website for an updated driver.
If no driver exists or the problem remain after installing the new driver, try a different cable or a different port on your Mac.
If none of the above works, again disconnect all peripherals from your Mac, hold down the "shift" key to start up in "Safe Boot" mode.
If the Mac starts up correctly, restart without pressing the "shift" key.
If your computer still does not start up properly, shut it down and restart it while holding down the Apple+Option-P-R keys; keep holding "all 4 keys" down until you hear the startup sound "twice."
If none of the above work Disconnect all peripherals from your computer. Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
(If Disk Utility cannot repair, you will need a stronger utility (3rd party) - Diskwarrior or Techtool PRO)
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751 and restart your computer.
Remove any 3rd party ram.
Reinstall Lion - This will install a "fresh" copy of Lion without archiving old system files but leaves the rest of your files in place.
If your computer is still under warranty or you have Apple Care, take full advantage of it by letting tech support deal with your problems. It's what you're paying them for.
Out of warranty - take the computer to an Apple store or an AASP. Whichever is more convenient for you.

E 72 crash and stuck on white blank screen

i just saved mms settings and rebooted my E 72 and then it would not start. it gets stuck on a white blank screen. what to do?

Try doing the following as well:
1.. *#7780# - Restore factory settings - resets all the settings to the default ( you will not lose any data)
- Make sure you back up your data first as you will lose all of it when you perform. The default code for ALL operations listed here is 12345.
2.*#7370# - Reformat your phone. ALL data may be lost. still it is a good idea to always do a back up of your stuff.
This you perform as a last resort. Nothing else is working.If the phone is not showing any activity, proceed with hard formatting , turn off your phone, hold the following buttons while pressing the power button. (the default code is 12345)
3. hard reset - hold the following buttons * (star key), 3 (number button) and talk/green key. turn on the phone and do not release those buttons until you see the Nokia boot up screen. once you feel the phone power up you can let go off the power button while still holding all three buttons.
If these codes are not working the only thing for you to do is contact your Nokia Care Center/Service for assistance.

Stuck on gray startup screen!

This morning my Macbook was running fine. I left it alone for 15 minutes and when I came back, it was running EXTREMELY slow and I couldn't get it to shutdown. So I did a hard shutdown (is that what it's called?) and I had to go to class thinking that maybe if I just left it alone for a few hours, I could turn it back on and everything would be fine. When I got back, I pressed the power button, heard the startup noise and got to the gray screen. And it stayed there.
I let it sit for about 10 minutes hoping that it was just running really slowly and it still did nothing. So I tried it again and the same thing happened. I even tried it a third time and still no luck. I have taken GREAT care of it and I've never had a problem with it whatsoever! The only thing I have done the past few days was installed iTunes 8. I am a little upset because this is my first Mac and I have had it 13 months now (Which means it is out of warranty because I didn't extend my Applecare) I have not been able to try and restart it with the installer disk because it's at home. Does anybody know what could be wrong?

The exact same thing happened to me but I may be able to add some more details to the process.
First, I also installed the itunes upgrade. Turned on the computer, started up itunes and left it running.
Then when I came back, the finder section of the desktop (apple icon and menus) was not there. First I tried to run the hardware check up (hold D while computer starts up) and it showed me no problems. So then I tried to reboot it and run the diskutility applications to see if it could identify the problem. The first time I ran the program, i got "Underlying Task Reported Failure on Exit".
So I rebooted the computer and tried to get to the desktop again, only it didn't show the desktop anymore. It just got stuck on the gray screen with the apple and the spinning graphic. My apple CD is also stuck in the drive and I am also getting a bit desperate.
Sadly, I can honestly say that it is not a hardware problem. This is a Mac Software problem that is in their hands to fix. I have a lot of information in that computer that I cannot afford to lose and I no longer have applecare, so fixing it through the appple store is going to be pretty expensive considering that it is just a software issue.
Please, if you have any more suggestions, please let me know.

HTC Rezound stuck on white HTC screen

As the title says, the phone is stuck on the white HTC screen. It wont turn on past that point. I've tried pulling the battery out and leaving it out for about 30 minutes then restarting it. Also tried taking the sim card out and restarting, and taking both the sim & memory card out and restarting...none of those worked.
I tried hooking it up to the computer as well, but it wouldn't recognize it.
Any idea how to fix this? Anyone else having this problem?

Did you upgrade the IOS to ICS? I purchased my phone in January and I had no issues with it until the IOS updated around August. Once that happened the phone started getting stuck in a reboot loop for no apparent reason (mid-use it would restart itself), figured out how to fix that, then it started overheating randomly (no apps open & when a bunch of apps were open) and then it would just shut itself off. Finally this happened.
I brought it into the store and they really weren't any help. They did a search to see if there was a fix for it but didn't actually TRY to fix the problem, just told me they'd send me a "new" phone on Monday.

Help! Stuck on white/grey screen apple logo spinning wheel

Hi, I wonder if anyone can help me?
I have a MacBook pro snow leopard 10.6 It won't start up it freezes on the white/grey screen with the apple logo. I have tried it in safe mode it has the bar underneath as it loads up to half way it goes off & the spinning wheel just carries on spinning forever!
I have tried cmd & v typed in a few things that I saw other people do then on the black screen white text the page is full of Disk0s2: I/O Error   tried rebooting but same thing happens doesn't start up.
Then I put my mac os x snow leopard 10.6.3 installation, features and refinements disc in but still nothing! I'm stuck anybody know what to do?
Thanks in advance if you can help me.

If it won't boot with the just the c key held down off the disk, it could mean there is a firmware password set.
If it won't boot off the disk with just the option/alt key held down, that means firmware has been wiped if all you see is a white screen.
If it has a firmware password, it should have asked you for it with a screen with a lock icon on it.
However it also could mean there is a hardware problem or the 10.6 disk is dirty, scratched, defective or not from Apple (warz).
Or your keyboard is bad or your using a external one and not the built in keyboard.
I think you might have to look into the possibility your EFI firmware has been hosed.
See this section of my User Tip here: ..Step by Step to fix your Mac
Need machine/operating system identification help?
Find the serial number, thus the model number and thus gives the operating system that originally came with the machine. However gives not what operating system version the boot drive was later upgraded to. Do not use older OS X verisons to repair newer verisons. It is possible to use the original operating system version installed on another boot drive to recover files from a later operating system non-booting drive.
https://support.apple.com/kb/HT1159#MacBook_Pro   https://support.apple.com/kb/HT1349
https://support.apple.com/kb/HT1559   http://www.everymac.com/ultimate-mac-lookup/
If the computer just ignores the at boot key commands (without showing the firmware password request) especially if you boot to a white screen (no initial boot screen), it might be your EFI firmware stored in NVRAM memory has been wiped. EFI is like a powerful operating system type firmware that loads before OS X or Windows in Bootcamp loads, programs can be installed in EFI, even malicious ones. (why it's very important to trust the source of your instaled software)
To restore EFI you need to use the identification links above to find the exact model of your machine. Then use another computer to download the correct EFI firmware from this Apple.
https://support.apple.com/kb/HT1237
Then follow these instructions to burn it to a cd or USB (untested) and apply it to the non-booting Mac. It likley will take 2 reboots for it to take hold and return the at boot key commands.
https://support.apple.com/kb/HT2213
..Step by Step to fix your Mac

Stuck at grey startup screen with spinning grey wheel

Software update wanted to install a new version of airport. Clicked ok and appeared to install. Restart then yielded grey startup screen and spinning wheel and it stays stuck there. Original MacBook Pro with 2Ghz Core Duo. Any ideas?

Hi, I have an i Mac but was having the same problem last week - getting stuck at the start up screen. I had no idea what to do but started a discussion and someone suggested the repair utility and it also told me everything was fine. Then she told me to do an Archive and Install and in the end that got everything working again. I don't know much about computers so I don't know if this will work for you, too, but it might be worth a shot. Here's the link to the discussion if you want to read everythign she told me: http://discussions.apple.com/thread.jspa?threadID=1457827&tstart=0

My macbook pro just gets stuck at grey startup screen

my macbook pro just gets stuck at grey startup screen

Reinstall OS X:
Reinstall Snow Leopard without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.
OR:
Reinstalling Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

Stuck at white startup screen

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